Loose brass bushings and safe mode not working

Markuspwn

I have noticed twice, that after uninstalling and re installing the trigger group the brass bushings would become a bit loose, and then after that the safe mode does not stay safe. Is this a common issue? everything is printed perfectly and so im curious why this is happening, should I just reprint the lower and hope? Last time I tried this it immediately got fixed by reprinting the lower but feels like a issue

undeadchew

Markuspwn Perhaps it's a scaling issue with your print, so a reprint won't fix it unless you fix scaling first.

Markuspwn

undeadchew Everything fits perfectly. It’s after repeatedly uninstalling and reinstalling the trigger group that the brass pin bushings become not fixed in the holes and will fall out. Maybe I’m accidentally pushing them out and causing the hole to warp from force?

undeadchew

Markuspwn Only underscaling would make parts difficult or tight to install, overscaling which is what I believe you are dealing with, parts would be easier to install with more clearance.

Print a calibration cube and measure it with a caliper so you can adjust scale, or print a large 1 layer square for mm per step adjustment. You need to rule this out first.

hoffmantactical

If the bushings become loose enough to allow the trigger and hammer to shift, that will create issues with the safety. What filament is this lower printed in?

Markuspwn

hoffmantactical pa12-cf, It works perfectly fresh print so I know its not scaling weird. Im going to try mounting the bushings with some loctite 620 to bond it to the exact location it needs to stay at so if / when I reinstall the trigger group it wont have the bushing pop / fall out causing the hole to warp out of spec.

patriotpa

Loctite 620, is generally not recommended for use with plastics as it might result in stress cracking or softening.
For bonding plastics, Try Loctite 406, which is an instant adhesive designed for quick bonding of plastic and rubber.

Markuspwn

patriotpa I looked into that just now and since 620 is for bushings, and my print lower is 99% infill with 12 walls it wont be a significant risk for cracking or softening. 406 is more akin to super glue for a quick fix where 620 seems like the best most resilient option for this to stay in spec. Thank you for the suggestion!