This is not a cheap 3D printer.
It’s a very affordable 3D printer - but
unlike filament-based printers, the story
doesn’t end there.
So while the Elegoo Mars is an incredible,
high-detail resin printer, you can’t just
it to any other machine that costs under 300
bucks.
So today, we’ll look at whether Elegoo are
actually managing to democratize printing
or if you should just stick to FDM.
This video is sponsored by NordVPN, more on
them later.
For some reason, when Elegoo introduced the
Mars for around 280 bucks, the internet just
went crazy over it.
But it’s not like the Mars did anything
really new and there were already machines
like it out there.
Even in a very similar price bracket, depending
on which machine was on sale at what time.
My experience has mostly been with FDM so
far, filament-based printers, but I did have
a Wanhao Duplicator 7 SLA printer for a good
while now, and even though it seems to be
practically the same machine as the Mars,
I never really managed to warm up to the Duplicator
7 for many different reasons.
So my take on the Mars is going to be from
that perspective, too.
And I do actually like the Mars a lot more
than the D7.
But let’s start out with the specs, and
they, too, are going to sound very faimilar.
At its core is a 5.4” 1440p smartphone screen
that gets you a 12 by 6.8cm print area with
a 50µ pixel size.
The Z-Axis does 15.5cm, which I think is more
than enough for the build area - when you’re
printing busts and stuff, you’re mostly
limited when it comes to how large you can
scale them up by the 6.8cm maximum depth.
Now, the resin the Mars is printing with cures
through quote-on-quote UV light, but technically,
the 405nm wavelength is deep blueish purple
and not UV, you definitely won’t get a sunburn
from it.
So inside the printer, there’s a large UV
LED in the bottom that shines through that
LCD screen, the LCD masks all the areas that
shouldn’t get exposed and cured and than
with every layer, the print surface just moves
up a bit, lets some fresh resin flow under
it and then cures the next layer below the
last one.
This printer actually prints all your parts
upside down, but you can just flip them once
they’re done.
One of the great features of the Mars is that
it has a touchscreen interface and a USB port
built right in.
With the early cheap resin printers you’d
basically run the masking LCD directly as
a second screen from a computer, which was
just horrible.
If you’d leave your mouse cursor on the
wrong screen, you’d actually get just an
extruded mouse cursor column just printed
next to your actual part, the computer couldn’t
go into standby, windows update messages would
screw things up, you know, the whole deal.
Here, you just save your print file to a USB
thumb drive and the printer handles the rest.
So let’s actually have a look at a few prints!
So, what did you see there?
The yellow prints were done with Wanhao resin,
the clear and grey parts were Elegoo’s own
resin.
And there is a massive difference between
the two.
I was never happy with the Wanhao D7, possibly
because I only ever used the Wanhao resin
with it.
The prints with Elegoo resin on the Mars are
clean, crisp, detailed, have only minimal
warp, while the prints with the Wanhao resin
warped a lot, supports broke off during the
print and actually, I could never get the
parts to fully harden and cure, even leaving
them out in direct sunlight.
These still feel tacky and soft, even after
two days of curing.
When I did the exact same thing with the parts
printed from Elegoo resin, they actually turned
pretty brown.
What I’m told is happening here is that
the partially cured resin, as it comes directly
off the printer, instead of curing to a clear,
strong plastic, actually breaks down from
the more violent UV rays that are a natural
part of sunlight - the same ones that give
you a sunburn.
Supposedly, once parts are fully cured under
the “normal” 405nm light, they are much
more UV resistant and won’t turn brown as
much anymore, which is why I’m building
a curing station with these mains-powered
405nm LEDs.
Overall, the print quality from Elegoo Mars
is damn impressive.
I don’t think I’ve had a print actually
fail with this printer yet other than when
it was clearly my fault for for example not
setting the bed correctly, they’ve all come
out looking really great.
The only thing that stood out as artifacts
are these lines that appear every now and
then, I have no idea what they are.
But overall, detail is great, reliability
is great and resin prints just always look
fantastic.
But of course, that comes at a price, not
just that you can’t really observe the print
as it’s happening like with filament printers,
but the fact that you’re working with resin.
Resin itself is nasty stuff, first of all,
it’s a sticky liquid, that, with this setup,
you will inevitably get on your gloves that
you’ll of course be wearing when using the
printer, that’s why I don’t have a ton
of footage of actually using the machine,
because as soon as I put my gloves on and
start working with the printer or the parts,
I don’t want to go back to the camera with
those same gloves and start smearing resin
over it.
I mean, if you try, you’ll barely get any
of the stuff on your gloves, but you never
know for sure.
And why wear gloves in the first place - some
people seem to think you don’t need them?
Because resin is really nasty stuff.
It’s not necessarily “toxic” in the
classic sense, but it can screw with how your
immune system works and give you chemical
burns.
Which look horrible.
You definitely do not want to get this stuff
on your skin, definitely not repeatedly, or
in your eyes, depending on the resin you should
also be wearing a respirator with an organics
filter, and that’s not just me saying that,
it’s literally in the material safety datasheet
from the manufacturers.
There are a few newer resins that either don’t
smell… as much, or human noses just don’t
pick it up, the Wanhao stuff smells horribly,
the Elegoo resin is a bit less smelly, but
compared to printing PLA, it’s still really
bad.
I’ve actually installed a fresh air ventilation
system here in the studio with an ERV so that
I could use these resin printers at all.
With the fumes just lingering in here, my
throat would start aching and my nose would
start burning, so really not something you’d
want in your living room.
There are also “plant based” resins now,
but as always, just because something is “natural”
doesn’t really mean anything, the resin
is still nasty stuff.
And of course, the prints right out of the
printer aren’t usable straight away.
With a filament printer, you just reach in,
pop the print off the bed and that’s it,
with resin printers you at least have to wash
off the resin from the surface of your prints,
typically you do that with isopropyl alcohol
or any other oragnic solvent.
Just like with the “plant based” resins,
there are now some resins that are water washable,
but you still can’t do that in the sink
like it’s implied, because with both water
or IPA, you can absolutely not pour this stuff
down the drain once it’s contaminated with
resin.
This is essentially hazardous waste.
Okay, and once you’ve washed your parts
you still need to fully cure them, because
they will at least be somewhat tacky still
on the surface and sometimes even still soft
all the way through.
And all this combined makes it really hard
to properly compare filament printing to resin
printing when it comes to cost and effort,
because for resin printer especially, the
printer itself is just such a small cog in
the entire setup.
Once you add up accessories and consumables,
you’re easily spending another hundred or
more bucks on top of the printer itself.
The resin itself is actually, I’d say, very
reasonably priced now, these half-liter, roughly
500g bottles of Elegoo resin are 25€ and
you can get them Prime shipped; and considering
you’re not usually printing large, chunky
parts completely solid with these resin printers,
that’s actually not too far off from what
filaments costs.
It’s still more expensive, but very reasonable
for being a less commoditized material I think.
On the other hand, I’ve probably spent as
much on nitrile gloves as I did on resin.
Speaking of parts that are hollow - the software.
And I’m actually pretty happy with it!
What Elegoo are recommending is ChiTuBox - which
is a closed-source software that’s definitely
not GDPR-compliant, that you can use for free
for non-commercial purposes.
There’s no option for anything but private
use - yet, but down the road it looks like
there will be a paid ChiTuBox Pro version
with, quote, more features.
The good thing is, it comes with a profile
for the Mars that works really well out of
the box - unlike the Wanhao D7 where I had
to manually set up one of three different
profiles in their software and none of the
ones they suggested was actually “correct”.
In ChiTuBox, you can add supports, automatically
or manually, tweak your basic print settings,
rotate, scale, align parts, all the stuff
you’d expect.
You can also hollow out parts like this bust
that don’t need to be super strong and would
just use a ton of material if you’d print
it solid.
I think that’s a pretty neat feature, but
I still need to figure out the best way to
then add holes so the resin that’s trapped
inside the part can actually escape.
With the parts that I’ve been printing hollow,
the holes were often too closed up after a
print and I’d have to manually peel them
open, and even then there would still be uncured
resin stuck inside the part forever.
It’s probably best to have three or more
holes in opposite corners on a hollow part
so that you can properly wash the inside,
too.
The hollow feature sometimes struggles a bit
with models that have multiple intersecting
shells, so with this one, I first combined
the bigger shells in Meshmixer and after that,
it worked fine.
And again, look at that print quality!
Now, speaking of software: Remember that video
that I did on why you shouldn’t download
and print gcode from the internet because
you don’t really know what’s in there
and it could wreck your printer?
It’s the same with SLA, there’s plenty
of mischief to be made with SLA printers if
you just use random print files you found…
somewhere.
But in either case, if the internet connection
you’re using isn’t trustworthy, then those
files can still be manipulated right before
they get to you.
Now, while that probably isn’t an issue
for print files, it is a very real issue for
using any of your private online stuff like
banking, email.
social media - not just could someone manipulate
what you’re seeing or splice in some malware,
but they could also end up stealing your passwords
and your data.
So that’s where NordVPN comes in.
When I was travelling to ERRF this last weekend,
I used their VPN service to stay safe in public
WiFis at the airport, in my hotel and any
other public WiFi I was using along the way.
What a VPN does is that it adds a layer of
encryption on all the data to and from your
device.
And while it’s encrypted, nobody can spy
on your data or manipulate what you’re getting.
Now, if you’ve seen others talk about NordVPN,
you’ll no doubt have heard that they’re
using “military-grade encryption”, so
I looked up what algorithm they actually use,
and it’s AES-256 with a 2048bit key, which
is basically uncrackable encryption.
They’re using the OpenVPN protocol, so you
can use it with basically any device, but
NordVPN are also providing really easy-to-use
apps for Android, iOS, Windows, Mac, Linux
and a Firefox and Chrome plugin and guides
for basically every device that can use it.
Go to nordvpn.com/tomsanladerer, that link
is also in the description, and you’ll get
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actually is a really good deal, I’ve paid
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NordVPN works with any application you’re
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Thank you NordVPN for sponsoring this video.
Okay, back to the printer: Build quality is
very good.
There’s no Z-wobble, the parts feel solid
and even the resin container, the vat is a
heavy chunk of milled aluminum.
Elegoo also offer a 4-pack of plastic vats
for a very reasonable price, and I think it’s
basically a must-have if you’re printing
with more than one type or color of resin.
Cleaning out the vat just to print with a
different resin is really not fun, and in
this one that has the clear resin in it right
now you can still see some leftovers from
the yellow Wanhao stuff even though I cleaned
it out as well as I could.
The printer is also quite loud during use
-
and the only source of noise is that fan that
cools the UV LED in the bottom here.
It’s always on and it’s definitely noisier
than a quiet filament printer, but maybe a
fan swap can solve that.
Then again, you probably don’t want to be
in the same room as the printer anyways because
fumes.
And two more things on the topic of the UV
LED - because apparently the Mars only uses
a simple reflector to “spread” the light
from the LED over the entire print area, I’ve
been told that you can run into issues where
the center actually gets exposed more than
the edges of the print area, but I’ve not
run into that; and supposedly the LCD screen
used in here can or will fail at some point
due to the near-UV light.
I’ve heard anywhere from 1000 hours - which
would be after just a few bottles of resin
- to tens of thousands of hours.
Just something to keep in mind, the screen
may be a consumable, but thankfully, the actual
screen part itself is only 30 bucks in materials
if you can manage to swap it yourself.
If not, well… too bad.
And of course, the LCD is right under the
print surface, so if your Mars is missing
that one retention screw like mine did, the
aluminum bed will shoot straight down towards
the LCD when you level the build plate for
the first time.
It’s a quality control issue that shouldn’t
happen, so check that your printer has this
screw right here installed before you loosen
the bed for leveling.
But other than that, the leveling mechanism
is actually pretty simple and effective.
The actual touchscreen LCD is right up front
and makes the printer easy to use, there’s
everything on there that you’ll need to
run the Mars, you even get small thumbnails
of the print you’re about to start, but
the USB port is on the back, which, just like
the Ultimaker having its spool mounts on the
back, is kind of inconvenient.
So is the Elegoo Mars a good 3D printer?
Yes.
I’m really happy with it, but then again,
it feels like a resin printer itself shouldn’t
be hard to get right.
I know everybody likes car analogies, so just
comparing different resin printers is like
comparing different car engines - it’s definitely
the core part of a fossil-powered car, but
there’s so much more to a vehicle than just
the engine.
Like, this is a good engine, but that’s
all it is.
So, really, a good system for resin printing
should also factor in some way of cleaning
the parts, resin handling, which Elegoo actually
does comparatively well at with the VAT packs,
and it should also include a way to correctly
cure parts.
That makes it hard to compare a resin “printing
engine” with a filament printer where you
don’t really need anything else but the
printer itself to produce parts.
But still, if you’re looking for just a
resin printer, the Mars is a super solid choice
right now.
And if you’ve been watching my stuff for
a while, I’m very cautious with saying something
is “the best” one, because I usually haven’t
thoroughly tested every single other machine
there is, but this is definitely the best
one I’ve ever used.
Sample size 2.
So thanks for watching, let me know in the
comments what your take is on resin printers
- too much hassle?
Totally worth it?
I’m still undecided.
Thanks again to NordVPN for sponsoring this
video and to all my Patrons and YouTube members
for supporting the channel directly, check
out the links to the Mars and the VAT pack
in the description and I’ll be back with
cool stuff from the East Coast RepRap Festival
in the next one!
See ya!
