I bought a Harbor Freight 1/4" Trim Router and 6mm end mills but the bits do not securely mount in the 1/4" collet. Do the end mill bits get hot enough to melt an ABS plastic collet if I 3D print a collet? Or does anyone have a way to adapt the collet on the HF trim router to 6mm?
I think they get warm enough to deform abs and PETG, especially if you are running inefficient feedrates. Thr problem is, if you want to test, the moment it fails, it will be disastrous. ABS and PETG are aslo a fair bit squishy, so I’d think you’d loose grip too. I’d look for one of the metal collet sleeve adapters, been using that for awhile now, even in aluminum, works great. I got mine from rockler, but it looks like the same ones on ebay from china. The runout is pretty low on mine (in addition to the 611’s runout), but would be good to check.
I bought the variable speed spindle from Banggood along with various sizes of ER11 collets.