I’m in the early planning stages of building a LRv3. I have a Voron v2.4 3d printer that is optimized for printing in ABS. I generally never print in PLA and prefer not to. Has anyone printed the parts in ABS before, and did it work out OK? Would I need to resize the parts slightly to offset the ABS shrinkage?
Are there 2 or 3 interlocking parts that would be a good test bed to print first and try to answer some of these questions myself?
I used to print mostly in ABS, and have switched out. Now I print primarily in PETg. The only thing that I miss about ABS is vapour smoothing the parts by putting them on a rack in an enclosed space with acetone in the bottom. I don’t miss the shrinkage, or warping, that’s certain.
I am usually more concerned about break strength and temperature resistance in things that I print, and the fact that the PETg that I buy is foodsafe is a bonus too when things I print are going to live in my fridge.
That said, my LR3 is printed from PLA. ABS and PETg both get their strenght from flexing before breaking. PLA is more rigid, so it doesn’t flex as much before breaking, but in general doesn’t flex as much period. Rigidity is one of the big limiting factors for something like a CNC machine, and so in order to get the best rigidity, make it from the most rigid materials available. In this case, it’s PLA.
How much does rigidity count? Well, that will depend on your project. If you are cutting coasters from pine, you’ll never notice. If you are making precision joints in hardwood or aluminum, you might need to get more picky.
Since my usage case was (and remains) a bit uncertain, I opted for the best possible outcome, and printed in PLA, and then went back to PETg for everything else afterwards, with the same settings that I used before.
It certainly could print PLA, but I’d have to remove the enclosure panels (and I still print ABS regularly, so they’ll be on/off a bunch as I work through this build), I haven’t spent any time developing good PLA profiles, and the part cooling is designed around ABS, so it is likely insufficient for fast PLA printing. All obstacles that can be overcome, for sure, but I have a machine that is excellent at printing ABS, which is a material I prefer, so I was hoping it would make sense to stick with that.
However I see the point about rigidity, so if I do go forward with a build, I’ll bite the bullet and make that happen. If nothing else, its a good excuse to burn through some of the PLA that I’ve had on hand for the last several years.
My railcore is enclosed and it prints pla just fine. Worse case if it’s really warm, like if we don’t have the ac on, I might have to open the door and maybe lift the top a bit. That said, I did print my parts in cf-petg. I did add a couple extra shells to the print though.
do they make cf-abs, or gf-abs? I don’t like printing abs, so haven’t looked.
My LowRider V1 was printed with ABS, then each part polished with acetone.
I use 103%-104% resizing to allow for shrinkage in my setup.
Still working fine a year later.
Must get around to upgrading it to V3 sometime this year.
I used ABS faithfully for years. I had waged a war against warpage and in the end, found what kept it from warping. Since discovering PLA+, I haven’t ever looked back. Sometimes I print in PETg, but my LR2 was printed 100% in PETg and I’ve had some serious warping & sagging with those parts over the 4 years it’s been running. In the process of rebuilding it now because of the PETg sagging, and the MDF warping. Sadly I have to finish rebuilding it first, just to cut the parts for my LR3. PLA+ is better than PLA, but only in very few aspects, as temp resistance, and the way it breaks vs the way PLA breaks. I think tensile strength is the word I’m looking for, but it’s not a HUGE difference over regular pla. It just prints so much nicer and easier, without the flex.