Kobo Mini BlueFly vario and bigger battery back case

thingiverse

This is a Kobo Mini back case for using with the BlueFly vario TTL GPS module. It is designed to fit a bigger battery and features an easy-to-use power switch. This case should be compatible with the v10, v11, and later bluefly TTL GPS versions as long as they maintain the same shape and component location. Works exceptionally well. Instructions: - The case is designed for replacing the entire Kobo back case, and there are two variants: one for using with the original M1.6x3mm closing screws and another for replacing them with M1.6x8mm ones. - Print the parts and re-drill the six screw holes with a 2mm drill to remove the self-contained support layer. - Install the Bluefly module, trim, and press the top cover; it should clip on, but you can use some superglue drops for fixing the lid (take care with the pressure sensor and don't forget the neoprene light protection). - If you want to install the improved slider switch, cut the top plastic tab to remove the original one (see pictures). - There is a hole on the bottom side; you can install a loop here and secure it to your cockpit. - Step source files are included so you can modify and share your mods! - Extra battery notes: Replace the original 1000mAh battery cell with the new one (I use a 3800mAh cell). Take care, LiPo batteries are hazardous and may produce fire if not managed or connected properly. Check their connection and risks before replacing; use a self-protected type one, carefully check the current and temperature during the first charges, and don't leave charging unattended. Battery used: Dimensions - 3.6 x 75 x 94mm; capacity - 3800mAh according to seller specifications. VBackup pin: On new Bluefly boards, the VBackup pin has been removed; you can connect the VBackup to the main power supply of the board by soldering the two new pads. This doesn't make much sense if you want to "auto-power" the module with the Kobo. I prefer to use the VBacup in the old way and connect it directly to the Kobo Mini battery (TP2). This function is optional but speeds up the fix by storing the latest satellite data and preserving the GPS clock (see yellow cable on pictures). -UPDATE: 12/Aug/2018 - Added BlueflyVario TTL GPS v12 version (1.5mm taller, untested). -UPDATE: 18/Nov/2016 - Added new lid with "XC FLY" text (text is 0.4mm deep; take care if you want to print it in two colors like me). -UPDATE: 17/Nov/2016 - Updated battery notes (safety = single cell). -UPDATE: 02/Nov/2016 - Added back case for M1.6x8mm screws. -UPDATE: 19/May/2016 - Added extra battery and VBackup pin details. Contribute by donating: This design has a lot of effort and testing, so please consider making a donation if you like it and find it useful; any amount will be greatly appreciated and contribute to improved and future designs. You can donate here: http://villamanydonate.blogspot.com Thank you! Print Settings: Rafts: No Supports: No Resolution: 0.25 Infill: PLA 20%