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32 day easy build

in Show and Tell

I build the 32 day easy build recently. (Using the 12 day drive.)

I printed it in PETG using the recommended printer settings.

The only issue I had with PETG is that the frame is a little more flexible and

you have to be carefull not to warp it when you hang it on the wall (leave the

mounting screws a little loose). It's working well. Since I have a MK4 with the MMU I added

a few decorative touches. It's been running well for about 2 weeks.

A note on bearing selection: Of the ten bearings I bought only 4 would spin freely even after cleaning with carb

cleaner and compressed air. The free swing test worked ok while using 2 of these 4 bearings but failed with the rest.

The others were ok for use in other parts of the clock. Pick good bearing for the pendulum hanger.

1 comment

1 Comment

Steve

Mar 16

Nice colors and nice extra touches. The gold and black go well together.

Thanks for the feedback regarding PETG. I only tried it once and didn't see any friction reduction, so I went back to PLA. This clock is one of the few that does not have standoffs that adjust to an uneven wall. The compact frame doesn't allow them.

I use these bearings https://www.aliexpress.us/item/2251801799263630.html

I usually test 4-5 bearings by placing them on an arbor and spinning them by hand. The two that spin the longest get used on the pendulum. I cannot remember the last time that this simple selection process was not good enough for at least 15 minutes on the pendulum free swing test. Occasionally, the pendulum gets sluggish after a few months and the clock fails the free swing test but passes after another cleaning in 91% alcohol. They usually run forever after the second cleaning.

Maybe this supplier has better than average quality. They are listed as ABEC-1, which is the lowest possible rating other than "unspecified". They have worked really well for me.