This is a 3D printed pendulum clock with an 8-day runtime and an accuracy of around 1-2 minutes per week.

The primary goal while designing this clock was to make it functional as an accurate time keeper. It has a deadbeat escapement which remains accurate with variations in weight or power train friction. I wanted it to have a long runtime so it would still be keeping time if I was away for a few days. It took a few refinements and a few internal metal components to reduce friction enough to allow an 8-day runtime.

The gear outlines and escapement were designed using Gearotic with final cleanup in TurboCAD. All the parts were printed on a Prusa MK3 in PLA with a standard single color print head. Layer changes were used to print highlights on the dial. The total print time is just under 90 hours.

The design was made to look as much like a traditional brass clock as possible. The gears were printed in gold and made as symetrical as possible. I wanted a traditional Roman numeral dial including the use of "IIII" instead of "IV" at 4 oclock.

This design has evolved for about 6-8 months until it has reached the current form. I am quite pleased with how it looks. It won a prize in the Hackaday.io 3D Printed Gears, Cams, and Pulleys contest at https://hackaday.io/project/163814-3d-printed-pendulum-clock. It also has a really bad YouTube video at https://www.youtube.com/watch?v=imYTm0Vh5TA (Mostly, just proof that it works)

09-Oct-2020 update: An improved version of this clock design has been posted to https://www.myminifactory.com/object/3d-print-small-pendulum-wall-clock-136608 It has increased gear clearances and a more predictable escapement design. A larger and much more impressive design is posted to https://www.myminifactory.com/object/3d-print-large-pendulum-wall-clock-137009 as a premium design.

10-Nov-2023 update: A complete re-design of this clock was posted to https://www.myminifactory.com/object/3d-print-small-8-day-clock-337387 Every part has been optimized with the goal of making the clock easier to build. The bill of materials has been cut in half. All parts connect without glue, and the stainless-steel bushings have been eliminated. It is my most reliable weight driven clock with an 8-day runtime. It is a premium design, but the price has been set very low.

Videos of the larger clock and some of my newer works in progress can be seen at https://youtu.be/kn1OaGAae5w

Assembly videos for my large clock are now available. The assembly is roughly the same, although the larger clock is easier to build since it eliminates the stainless steel bushings. The runtime is only reduced slightly to 4.5 days.
Assembly part 1 https://youtu.be/NduVa_3wJFY
Assembly part 2 https://youtu.be/IOmcpzH5iek

My newest clock design can be seen at https://www.youtube.com/watch?v=djp73Q6tXZA It can be configured with various runtimes up to 32 days. It is a premium design available at https://www.myminifactory.com/object/3d-print-156759 Construction has been simplified to the bare minimum of non-printed parts, just one size bearing, one screw size, two sizes of metal rod, fishing line, and BBs for the weight shell. The savings in material cost is greater than the nominal charge to purchase the design.

Steve

22-Apr-19 Update: Added keyhole_hanger.stl that can be used if you have trouble finding metal keyhole hangers. Print with at least 50% density. Also added split versions of front and back frames to be used on printers with small print plates. The front/back_frame_split_top.stl and front/back_frame_split_bottom.stl files replace the one-piece frame components. Epoxy the parts together with 2" pieces of 6-32 threaded rod for strength.

04-Sep-19 Update: Added split version of weight hanger to allow printing on smaller printers. The maximum height of either half is under 100mm. Print weight_shell_split_top and weight_shell_split_bottom. The two components join together using four 6x1-5/8" drywall screws. As an added benefit, the lower portion of the weight shell is stackable to create any height weight shell. This might be useful to create a taller weight shell that can be filled with lower density material such as copper or steel.

07-Oct-19 Update: Re-uploaded identical copies of the split weight shell to let them be processed again. It looks like they are now able to be seen in Thingview mode. Also added weight_shell_split_bottom_quarter which is a 1/4 height weight shell adder if you need a slight weight increase.

19-Feb-20 Update: Added Pendeluhr_BauanleitungDeutsch.pdf German translated instructions that were graciously provided by Henri Huber.

30-Apr-20 Update: Added shaft17_3piece.stl which is a 3 piece pendulum shaft for small delta printers that could not fit the two piece shaft.

09-Oct-23 Update: Added a new pallet with a solid connection to the pendulum arm. This update will improve reliability. Details are in addendum_SP1-5_2023_Oct.pdf. Note that if you are starting a new print, it is recommended to download a completely updated design from https://www.myminifactory.com/object/3d-print-small-pendulum-wall-clock-136608 There are too many changes to update this version on Thingiverse.