I've modified my derivative filament spindle design to accommodate for slightly thicker 1/4" acrylic and made some modifications to reduce the likelihood of "binary failures" including this modification for reducing stress on the t-slots (thanks to tinkerings for pointing this out to me):
Same overall construction as the last spindle except that you'll now have to use 20mm or longer bolts to install the pieces that hold the M5 nut in place.
See it in action here:
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