Desktop Cannon
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Published on October 26, 2012
Description
A spring loaded Cannon
using a plastic printed spring
Useful for killing Time.
using a plastic printed spring
Useful for killing Time.
Instructions
I am including an Assembly file so that all the parts can be oriented properly. Scale as needed.
Print the Plunger (which includes an integral spring) vertically. No support should be needed.
Also print the barrel vertical, breech side down.
Two spreaders need to be printed, glue to Carriage sides.
the cannonballs are made in half so as to be hollow, so glue together. You can also used balled up paper.
for retaining pins on the wheel's axles, use a piece of extrusion filament doubled over and inserted into the axle hole to form a 'cotterpin'.
Insert Plunger into Barrel, and glue on PlungerHolder.
Barrel should snap-fit down into carriage.
For more power, break off plastic spring and use your own metal spring (available at most local hardware stores).
As always designing like a Boss! ;>)
Print the Plunger (which includes an integral spring) vertically. No support should be needed.
Also print the barrel vertical, breech side down.
Two spreaders need to be printed, glue to Carriage sides.
the cannonballs are made in half so as to be hollow, so glue together. You can also used balled up paper.
for retaining pins on the wheel's axles, use a piece of extrusion filament doubled over and inserted into the axle hole to form a 'cotterpin'.
Insert Plunger into Barrel, and glue on PlungerHolder.
Barrel should snap-fit down into carriage.
For more power, break off plastic spring and use your own metal spring (available at most local hardware stores).
As always designing like a Boss! ;>)
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License
Desktop Cannon by JDCUBED is licensed under the Attribution - Share Alike - Creative Commons license.
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I printed the cannon with a MakerBot Replicator 2. It looked cool and shot the cannon ball a few feet. Here are a few thoughts:
- Don't print all of the pieces at once. I grouped the items by orientation and whether or not I printed them with a raft. This worked much better.
- I couldn't ever get the plunger holder to successfully print. It would always come lose from the build plate during the print--even with a raft. I ended up making a square plunger holder. It didn't look near as good, but it worked.
- PLA isn't the best material for the spring. It is too brittle. ABS might work better.
- The cannon barrel isn't balanced so it's always pointing down. It might be a good idea to move the hinge placement so the cannon is balance.
Overall: great start but could use some modifications.