Added spool_pitch() function and more modern 300mm filament spool.

readme.md

@@ -2303,6 +2303,7 @@ Filament spool models
 | Function | Description |
 |:--- |:--- |
 | ```spool_height(type)``` | Outside width |
+| ```spool_pitch(type)``` | Spacing of the rims |
 
 ### Modules
 | Module | Description |
@@ -2316,6 +2317,7 @@ Filament spool models
 | ---:|:--- |:---|
 |   1 | ```spool(spool_200x55)``` |  Filament spool 200 x 55 |
 |   1 | ```spool(spool_300x85)``` |  Filament spool 300 x 85 |
+|   1 | ```spool(spool_300x88)``` |  Filament spool 300 x 88 |
 
 
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vitamins/spool.scad

@@ -30,6 +30,7 @@ function spool_hub_bore(type)      = type[6]; //! Bore through the hub
 function spool_hub_diameter(type)  = type[7]; //! Diameter of the thicker hub
 function spool_hub_taper(type)     = type[8]; //! Diameter at which it tapers down to rim thickness
 function spool_height(type)        = spool_width(type) + 2 * spool_hub_thickness(type); //! Outside width
+function spool_pitch(type)         = spool_width(type) + spool_rim_thickness(type); //! Spacing of the rims
 
 module spool(type) { //! Draw specified spool
     vitamin(str("spool(", type[0], "): Filament spool ", spool_diameter(type), " x ", spool_width(type)));

vitamins/spools.scad

@@ -23,10 +23,11 @@
 //                              i    i   e   i  u  o   u    u
 //                              a    d   p   m  b  r   b    b
 //                                   t   t         e
-//                                   h   h   t  t      d    t
+//                                   h   h   t  t      d    taper_d
+spool_300x88 = ["spool_300x88", 300, 88, 43, 6, 8, 52, 214, 300];
 spool_300x85 = ["spool_300x85", 300, 85, 60, 4, 8, 52, 250, 280];
 spool_200x55 = ["spool_200x55", 200, 55, 40, 5, 5, 52, 200, 200];
 
-spools = [spool_200x55, spool_300x85];
+spools = [spool_200x55, spool_300x85, spool_300x88];
 
 use <spool.scad>