4 issues that solely present up whenever you go small
When I acquired again into 3D printing just a few years in the past, I targeted on printing giant issues. That’s why my first CoreXY printer was a Creality K1 Max, with a construct quantity giant sufficient to print an entire cosplay helmet in a single go.
However, over time, I’ve grow to be extra considering printing tiny issues. In explicit, I’ve been getting back into painting miniatures. While I get pleasure from shopping for injection-molded kits and portray them, there are such a lot of cool 3D models you may obtain that I’d like to print and paint. Unfortunately, my luck at printing these fashions at smaller scales has been blended, and as I’ve labored via the challenges, it is grow to be clear why.
Tiny layers barely get an opportunity to chill
Not so quick!
If you are printing a really small mannequin, your 3D printer’s nozzle might return to the beginning of the subsequent layer earlier than the layer you simply printed has time to chill. This means the brand new extrusion can distort the earlier layer, and, in fact, that is an error that may compound over time with every new layer.
This does not simply have an effect on small prints, however may also have an effect on massive prints with small options, like tapers. You can mitigate this in your slicer software program. For instance, the PrusaSlicer official documents listing quite a few methods to manage how your mannequin cools, together with setting a minimal layer time.
Alternatively, you may print a number of copies of your smaller mannequin without delay, giving every mannequin’s earlier layer extra time to chill.
Your nozzle doesn’t get smaller with the mannequin
Threading the needle, however the needle is tiny
When you scale down a mannequin, all of the options get smaller, which suggests you want a smaller mannequin to extend the decision of your printer and the smallest options it might print. Changing nozzles is not that onerous on fashionable printers, and you may go down from the everyday 0.4mm to a 0.2mm or 0.1mm nozzle, however that is normally the sensible restrict.
If you wish to print small, detailed fashions on a regular basis, it is in all probability price having a devoted printer with the smallest nozzle you may handle. Luckily, because the fashions you wish to print are so small, you will get away with a small desktop mannequin with a low construct quantity.
Tiny ft don’t give your print a lot to face on
Where the rubber meets the highway
Your mannequin must be firmly connected to the construct plate, however as you scale it down, the contact factors with the mattress additionally grow to be thinner and smaller. If you are printing figures with legs specifically, this may grow to be a problem.
You may add options like a brim to raised safe a small footprint, and it should not do something to hurt the ultimate end of the mannequin.
Alternatively, you may add a base like those you see above to your mannequin. Not solely does this make it simple to show, however it additionally offers a stable, clear contact patch with the construct plate at any scale.
Scaling down can flip working clearances into fused plastic
You do not wish to bridge each hole
The different drawback when cutting down is tolerances. Once you go beneath a sure measurement, your printer will not be capable to produce intentional gaps, and the 2 sides of that hole will merely be fused collectively.
This impacts articulated fashions, when components which might be presupposed to be hinged or transfer get so small that they are only one piece. Scaling up is never an issue, however there is a restrict to how small you can also make issues earlier than you are so removed from the supposed scale that the mechanics of the piece not work.
There’s no actual repair right here aside from altering the model itself, taking the consequences of a smaller sale under consideration. You may wish to widen a spot relative to the size of the remainder of the mannequin, or thicken linkages that might be outsized at an everyday scale, however now really keep in a single piece whenever you go small.
You can use a benchmark model like Clockspring’s Torture Toaster to find out how small your printer can go earlier than you simply get one fused lump.
Finishing the print might be more durable than printing it
You thought you had been performed?
3D prints all the time want some type of ending when the print head stops shifting, and the smaller the mannequin, the tricker it turns into. Removing helps and cleansing the marks they depart is comparatively simple.
The smaller you go, the more durable this cleansing course of is, and the extra doubtless you might be to easily break the mannequin whereas cleansing it.
My subsequent step could be a resin printer
The 3D printing know-how with the decision and end I’m in search of already exists, however it’s not FDM printing. I’ve resigned myself to the truth that resin 3D printers are the best way to go in the case of purely beauty fashions with numerous tremendous element.
I’ve been hesitant as a result of I’m conscious of how messy and difficult resin printing might be, however the know-how has come a good distance, and I believe client resin printers are actually on the level the place I may dwell with one. So, all I can say is that I’m trying into it, however there’s in all probability one in every of these fascinating little machines in my future someplace.
