Had space(more than 1px) between letters with custom font

Ok, so this is more for your interest than anything else. Using an Espruino Pico with a PCD8544 display, this code actually creates a new double-size font (with spaces) on the Espruino itself:

A5.write(0); // GND
A7.write(1); // VCC

var charFrom = 32;
var charTo = 126;
var charHeight;
var charWidths, charData;

function doFont() {
  var height = 6;
  var gbig;
  var gsmall = Graphics.createArrayBuffer(height*2, height, 1);
  var totalWidth = 0;
  for (var i=charFrom;i<=charTo;i++)
    totalWidth += gsmall.stringWidth(String.fromCharCode(i)*2);
  charWidths = "";
  charHeight = height*2;
  charData = "";
  for (i=charFrom;i<=charTo;i++) {
    console.log("Char "+i);
    var ch = String.fromCharCode(i);
    gsmall.clear();
    gsmall.drawString(ch);
    var w = gsmall.stringWidth(ch);
    gbig = Graphics.createArrayBuffer(charHeight, w*2, 1,{msb:true});
    gbig.setRotation(3,true);
    for (var y=0;y<height;y++)
      for (var x=0;x<w;x++)
        if (gsmall.getPixel(x,y))
          gbig.fillRect(x*2,y*2,x*2+1,y*2+1);
    charWidths+=String.fromCharCode(gbig.getWidth());
    charData += E.toString(gbig.buffer);
  }  
}


// Setup SPI
var spi = new SPI();
spi.setup({ sck:B1, mosi:B10 });
// Initialise the LCD
var g = require("PCD8544").connect(spi,B13,B14,B15, function() {
  // When it's initialised, clear it and write some text
  g.clear();
  doFont();
  g.setFontCustom(charData, charFrom, charWidths, charHeight);
  g.drawString("Hello",0,0);
  g.flip();
});

You could then re-encode it with btoa and make your own custom font again.

It'll only work if width*height of each character in the new font is a multiple of 8, but for your case that should be fine.

You should be able to modify that to just print your existing font (not doubling the size) while also adding a blank column.

Honestly though - I'd just use the code I linked above and change the number for padding :)