{"data":{"make":{"id":"521627","created":"2022-12-13T15:34:18.632018+00:00","edited":null,"deleted":null,"isMake":true,"printer":{"id":"18","name":"Prusa MINI / MINI+","__typename":"PrinterTypeType"},"parent":null,"author":{"id":"173643","handle":"Zurrie_173643","verified":false,"dateVerified":null,"publicUsername":"Zurrie","avatarFilePath":"media/auth/avatars/f4/f42c17bf-da5a-48ac-8c9e-e403643d9f3b.jpg","badgesProfileLevel":{"profileLevel":13,"__typename":"BadgesProfileLevelType"},"__typename":"UserType"},"images":[{"id":"396304","filePath":"media/comment_images/75/828483-2c0c-465a-8ad4-76bb84360101/dsc_1295.jpg","rotation":0,"__typename":"CommentImageType"},{"id":"396305","filePath":"media/comment_images/89/5530cf-9115-4463-8abf-7451ec6850ea/dsc_1296.jpg","rotation":0,"__typename":"CommentImageType"},{"id":"396303","filePath":"media/comment_images/54/dbbd89-7aad-40ab-879b-aed8fb61fe48/dsc_1297.jpg","rotation":0,"__typename":"CommentImageType"}],"mentions":[],"text":"It's very nicely made! Highly recommended.\n\n\nPrintet in Prusament only\nViva La Bronze, Mystic Green, Mystic Brown","rating":5,"likesCount":1,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"316852","ratingAvg":"4.8000000000","ratingCount":5,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType","model":{"eligibleForNomination":false,"id":"316852","slug":"orbox","name":"Orbox","authorship":null,"club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"4.8000000000","myRating":null,"ratingCount":5,"description":"

This is an iris box design which is perfectly spherical when closed (81mm in diameter). No support material is required for this design, although on some parts a brim is recommended. The multicolour designs are achieved by simply doing material swaps on a standard single nozzle FDM printer.

The box is opened by turning the twist collar to unthread it and open the mechanism. It is further rotated, while holding the base stationary, which turns the gears and actuates the iris door. There is an optional stand which makes holding onto the base and using the box easier (and stops it rolling away when you put it down).

This was originally uploaded to MyMiniFactory in 2021, and I have now uploaded it here as well. I have 14 other iris boxes designs and I have an instructable describing them and how to print them.

Edit: I have made the notches on the \u2018Internal Collar\u2019 larger to make assembly easier.

Box Styles

There are a few decorative styles for the components:

2 stands
2 bases
2 collars
2 gears
4 top door patterns

Beware that the second top door style 'Top door 2' will only work with 'Bottom door 2' and vice versa. In addition there are blank versions for a smooth sphere surface (although the smooth base makes opening the box quite difficult).

Parts Testing

When printing the bottom and top doors, I highly recommend using a brim to help them stick to the build plate, which should be trimmed off afterwards. The design requires 24 M2x6 countersunk screws to assemble (same as all my other designs) or M3x8 screws at 150% scale etc.

To test the fit of the screws, print one 'Top door' and one Gear. The screws should be tight (but hopefully not splitting the print) in the blind holes, and loose in the through holes. You can use contour/hole compensation in your slicer to account for this if there are problems.

Parts Printing

For the box you will need to print:

1x \u2018Body\u2019
1x \u2018Base\u2019
1x \u2018Internal collar\u2019
1x \u2018Twist collar\u2019
7x \u2018Gear\u2019
7x \u2018Bottom door\u2019
7x 'Top door'.

There are also optional 'Screw covers' for the doors and the 'Stand' to sit the box on.

Assembly Instructions

Step 1

Trim away the brim on the door parts using a craft knife and remove the print-in-place supports from the 'Bottom door'.

Step 2

Screw the rounded end of the 'Bottom door', to the top point of the 'Top door'. Then screw the other end of the 'Bottom door', to the middle hole of a second 'Top door'. Repeat this process until you have a chain of four bottom/top doors.

Step 3

Take the two 'Top doors' on the ends of the chain, and match up their edges to form a loop. Then take the loose 'Bottom door' on the end of the chain, and fit the cam into the slot of the matched up 'Top' door.

Step 4

Fill in the gaps in the loop with bottom and top doors to complete the iris mechanism. The screws should be tight enough to keep the mechanism moving accurately, but not too tight to make opening it wth your hands difficult (it will loosen a little over time).

Step 5

Next move on to assembling the body mechanism. Take the 'Internal Collar' and thread it, gear end first, into the narrow end of the 'Twist Collar' until it stops. This may be tight at first depending on your printer tolerances.

Step 6

Place this collar assembly, gear end first, onto the narrow side of the 'Body' component. Then place the 'Base' component onto the same end of the 'Body', making sure to line up the internal screw holes. Now you can screw the 'Base' and 'Body' together using three screws. This should also retain the collar assembly, but it should be free to rotate.

Step 7

Tighten the three body screws all the way, and then back them off 2-3 turns. The gap between the ring gear on the body, and the ring gear on the collar should be just large enough for one of the small gears to snap in place, to help prevent it falling out later. Adjust the screws until they just allow the small gears to fit.

Step 8

Now for the fiddly bit. The internal collar has 7 small notches around the perimeter, these are to line up the small gears around the body; the gears need to be both evenly spaced and at matching angles for the mechanism to work properly. I find it easiest to take each gear, and line the raised hole up with the notch on the collar. Then lightly press the gear into place on the body, making sure it is straight. I then repeat this process around the body pressing in all the gears.

To prevent other gears falling out during this process, it can help to use a rubber band to hold them all lightly together. It also helps to lightly hold the body and base together to hold the gears in place. Do a quick check to make sure the gears are evenly spaced and match around the body, adjust any that are out of alignment. Now you can tighten the body screws to firmly hold the small gears in place (but not too tight to lock up the mechanism).

Step 9

The small gears should turn in a synchronised fashion as you turn the collar (the gears can only be turned by twisting in one direction). Turn it until the raised gear holes line up at the open side of the body. You should be able to thread the twist collar back in until it touches the raised lip on the small gears, forming the lower hemisphere.

Step 10

Now take the assembled iris in the closed position, and place it onto the body. Line up the door holes with the holes in the small gears; this will require adjusting the thread position to line up the holes vertically. Then screw in all 7 doors onto the small gears. Make sure these are tight to make sure the mechanism moves properly, but not too tight to lock it up.

The box should now move by twisting the collar and holding the base. The screws will likely need re-tightening, and 'helping' the iris section open and close by moving it manually with your hands at first until it operates smoothly. It may take a few tries to get the right tension on the outer screws.

Step 11

Once you are happy with the box operation. Press the optional 'Screw Covers' in place (I don't recommend gluing them, otherwise you cannot dissassemble the box fully and you may glue the rotating screw joints) to hide the screws. You can also use the optional stands to display and open the box more easily.

Step 12

Enjoy your 'Orbox', I hope you like it :). Let me know if you are have any questions or difficulties with the design.

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:)","rating":null,"likesCount":0,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"316852","ratingAvg":"4.8000000000","ratingCount":5,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType"}]}}}

Orbox

Orbox

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