Update README.md

README.md

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-# sugarloop
+# Sugarloop
 A waterproof case with inductive charging for RileyLink boards (433 MHz version)
 
 ## Case
-The waterproof case consists of two parts (top and bottom) and is sealed by a silicon seal. Feel free to print one yourself or have a look at Shapeways if you do not have access to a 3D printer.
+The waterproof case consists of two parts (top and bottom), is sealed by a silicone seal and helt in place by a rubber band. Feel free to print one yourself or have a look at Shapeways if you do not have access to a 3D printer.
+
+### Print settings
+Some very decent print result was archieved with the following setup:
+- Prusa i3 MK2
+- 0.4mm extruder nozzle
+- Infill 20%
+- High quality PLA, preferable color white to better see the charging led
+- Support structure for top of the case with some additional support blockers
+- print time for top and bottom about 4 hours
+
+### Seal
+The main silicone seal is borrowed from AMP Superseal connector with 6 positions (Digikey Partnumber A106530-ND). Any rubber band with decent tension is good enough to hold to top and bottom of the case in place.
 
 ## Hardware
-- QI
-- Seal
-- Lipo
+
+### Inductive charging module
+To add reliable inductive charging to the case make sure to use [Adafruits Universal Qi Wireless Receiver Module](https://www.adafruit.com/product/1901). The flex PCB might be cut off (1mm) on the left side in oder to fit the top-case. Connect the charging module to 'ALT PWR' on RileyLink side. Make sure to double check for ground and VCC.
+
+### Battery
+The battery compartment can hold up to a 900mAh LiPo battery pack with a standard JST-PH connector (2mm pitch). Make sure there is enough space between the inductive charging module and the LiPo battery due to expansion while charging. Sucessfully tested with a LiPo battery 42mm x 34mm x 6mm.
+
+## Test
+Please make sure to test your case in a water condition before inserting the electronic components. Small pieces of paper added to the case compartments work fine to detect potential water leaks.