Gramophone For Smartphone

Amplify your music/podcast in style with this amplifying gramophone bell.

This is somewhat complicated build, lots of parts and tolerances.

The Phone Holder piece is designed with Samsung Galaxy S 20+ in mind but probably will fit many smartphones. Anyway, the phone holder is designed to tight-fit and not glued so you could design your own (original CAD file uploaded as well, SOLIDWORKS2019).

General notes:

• bell segments are identical, therefore only one unique file. You'll need 13 segments.
• spiral segment are Unique, therefore make sure to distinguish and label each spiral part with it identifying number. In the pictures there's parts naming guide to help general understanding where every part goes.
• Fit between phone holder and spiral is best with some layer/s of tape. I'm not specifying specific brand given availability is different around the world. Best practice is to put one layer, test fit, add one layer at a time until tight fit is achieved. With no tape, you risking the phone holder will fall out with smartphone and smash to the table.
• You'll need superglue and 

Printing instructions:

1. All parts should be printed without supports.
2. Phone Holder has built-in supports to be removed. It is ideal to define the parameters and infill of the 2 built-in support bodies ONLY to save material (I printed with 1 parameters, 1 top, 1 bottom, infill 5%). Part itself should have regular/the same settings as all the other prints.

Pre-gluing Prep:

1. The build is using filament as dowels.
2. All parts of 2mm diameter holes built into them. Drill every hole with 2mm twist drill bit with no force, to make the hole a true 2mm in diameter and smooth it out.
3. sand each mating face with ~200grit sandpaper. BE VERY CAREFUL NOT TO SAND TO MUCH! 7 passes max, otherwise fitting errors will enhance on top of the usual printing tolerances.
4. Cut ~6mm dowels from filament. It doesn't have to be the same color since they're hidden.

Assembly:

1. Start with the bell. Put a drop of superglue in each hole one side, then insert dowels. Wait ~20 seconds for the glue to settle.
2. spread superglue all over the seam faces. Don't use too much or there will be oozing and cleanup to be made (Probably after 2 seam glue-ups you'll find the correct amount to applicate, until then be conservative).
3. connect the next segment of bell and push the two segment together so that they'll be flush with one other. Hold with your hands for about ~20 seconds. BE CAREFUL, too much pressure and the angle between the parts will make them break away from each other.
4. glue up 2 sub-assemblies: one with 6 bell segments, one with 7. Then, glue one of the seam between them.
5. The last seam of the bell is a little tricky. The two faces/sides should be pretty close to each other but slightly off due to tolerance stacking. before applying glue, prepare several strips of painter's taps to help with the clamping.
6. Apply glue to one side, then push the two seam faces together. Use the painter's tape to clamp the two sides together.
7. Start gluing the spiral. Spiral Segment 8of8 is the closest to the bell and Spiral Segment 1of8 is the part near the Phone Holder.

Phone Holder:

1. The Phone Holder has 2 built-in supports, one is a ring and is block. Use flat narrow screwdriver to help remove them.
2. Glue Phone Holder to Phone Holder Inner Sleeve Adapter. Push the sleeve all the way it possibly could into the Phone Holder.
3. One the part of the Inner Sleeve that remained protruding from the bottom face of Phone holder, add to them on layer of tape and test fit. Add additional layers until tight fit is achieved between Phone Holder and the Spiral.

Roll support:

1. The Roll Support is a late edition, not designed in the first place. It needed to be made to prevent roll of the whole gramophone due to poor stability (even though center of mass was taken into account during design stage, some other parameters were neglected).
2. Use the picture that marks the gluing location of Roll Support Leg and glue it.
3. Put the Roll Support Foot inside the leg. No glue required, make the two bottom faces flush to each other.