I am planning to use PETG for corners as I can see those parts requires some tightening, tight it just right and crack the piece is sometimes only a quarter turn away
but printing all parts with PETG seems time consuming because the slower speed (40mm/s vs 80mm/s)
this sound so greedy that I don’t want to double the printing time but still want the build as rigid as possible.
I really appreciate some advice that which PLA parts failed you and you have to do it with stronger filaments (PETG, PC+, PLA+ etc)
my current plan is to print feet and corners in PETG, anything else?
PLA is stiffer than PET, but PET can handle higher heat and is marginally stronger. My center section is all PET, but I think my tower parts are PLA, can’t really remember anymore. Either will do fine unless you have your cnc in an unheated or cooled garage and you get a lot of extreme temperatures. All the parts from the store here are PLA.
actually I am planning to put that in my basement workshop, there is no heat in the winter, it’s about 10C at most, in the summer there is no window so no heat exchange, it’s about 23C
so I am thinking other than corner parts, the rest will be in PLA for now and see how they hold up, any broken parts will be replaced with PETG, PLA is way easier to print and faster.
At what ambient temperature would you need to worry about PLA melting/deforming? I’m not sure how hot our garage gets, but I would assume 100F or higher might be possible on especially hot days.
My shop here in AZ gets up to 120F+ in the summer when I am not in there with the A/C running. I have multiple printers and the MPCNC. I’ve only ever had one part deform that I would attribute to temperature and it was a tension lever for a customer extruder that was printed from PLA. The high heat and constant strain made it deform by about 2mm, but even that took a very long time at those temperatures. Other than that, no issues. I have steppers that get hotter than that with no ill effects on the PLA mounts.
original plan was to print a PETG and PLA mix parts, but I think I will print them all in PETG with 30% triangular infill, hopefully that’s strong enough
All my pet-g parts are 4 perimeter, 50% infill. Most of the printed parts on both my cncs are pet-g. Mainly because it will flex a little before breaking. Pretty sure the only pla parts left are the feet on the mpcnc. I just printed the new feet, also in pla, 3 perimeter, 50% infill.