Electronic Sand Timer Top Remix to use with Filament

thingiverse

Most of this file is entirely new material, with only minor modifications made to accommodate the OP's use of PMMA tubes. I've increased the diameter of these holes to 1.83mm, which will provide sufficient clearance for 1.75 transparent filament to be used in place of traditional PMMA light tubes. Keep in mind that even though this project has not yet reached the printing stage, it may be necessary to apply a small drop of CA adhesive to seal the filament in place. Most brands specify a deviation of up to .05mm, which would result in a maximum diameter of 1.8mm. However, if the actual deviation is on the lower end, resulting in a diameter of 1.7mm, it's possible that the filament may be too loose. It might also be beneficial to apply heat finishing to the interior end of the tube before insertion, which will create a glossy convex shape capable of capturing as much light as possible. Additionally, cutting the exterior to provide more refraction could enhance visibility of the LED. Further testing is required to validate these suggestions.