How hard is it to build a 3D printed clock?
Not too hard, I do my best to make it as easy as possible. some basic tools may be required, like utility knife, files, drill bits, sanding paper, and other basic tools that often com with 3 d printers
Are they instructions provided?
Paid files usually come with detailed instructions and Youtube videos. free files do not have so much support. Watch the videos are make your decide if you think you can do it.
Do you provide a refund?
Short answer is NO. The amount are small. Like I say earlier, watch the videos and check out the instructions. It is your decision to go head in the project and buy the file.