Stepper motors and linear scale closed loop setup?

Time to install the linear scale on the Z axis. I have come to rely totally on this configuration.

Start of the job to fix the Y axis. It is a rather big job since the whole machine need to be brought down into pieces. Here, some new thoughts of the Y axis design and the making of new parts.

Fitting the new Y axis mechanism.

A bit of reinforcement while it is disassembled.

You have been a busy man with that project. Nice job and thanks for sharing.

I have never done the polymer concrete thing but may try it some time. Anything that you would recommend doing differently if you had to do it again?

For the epoxy granite, there are two things. The first thing is to mix the gravel with sand and the next thing is not to run so aggressively with the sander. It wasn't very obvious, while I w<s sanding. that the sander did compact the gravel, but looking at the video I can for sure see that the amount of runny epoxy on top of the gravel increases. I would like like to compact the gravel for a longer time. Without causing leakage.

Another thing was mentioned in the comments and that is a modified screw connection for the column. I used the old tapped holes and it will for sure be stiffer. But I could have used longer screws. installed new nuts in the epoxygranite and that would probably give an even stronger connection for the base of the column.